Transverse tubules. - tubules formed by invaginations of the sarcolemma and flanked by the sarcoplasmic reticulum, they carry action potentials deep into the muscle fiber. T tubules and SR provide tightly linked signals for muscle contraction. T tubules at each A band/I band junction-continuous with the sarcolemma.
Standard Sizes of Sofas. Sofas vary in size, from 6 to 8 feet long and 32 to 40 inches deep for a standard size sofa, to 4 to 6 feet long and 28 to 30 inches deep for a loveseat.The actual depth of the seating area is reduced by the depth of the sofa's arms and back of the sofa.ofas vary in size, from 6 to 8 feet long and 32 to 40 inches deep for a standard size sofa, to 4 to 6 feet long and 28 to 30 inches deep for a loveseat.
An average outside measure of a sofa is 86 inches wide (long), 38 inches deep and 37 inches high. The inside measures are important because you want to have just enough room to lay down or seat more people. If you are petite, 19-21 inside inches depth is enough. But if you are tall, get a couch that has 22-24 inches inside depth. The same about the height of the sofa back. Overall Height: While average height is 37 inches, some contemporary sofas are 33-34 inches. If you choose a couch that is 40-44 inches high, which is quite unusual, make sure you have a place against the wall since it will not look good in the middle of the room, floating.